[BAEL-7441] Fixing EOFException in Java

core-java-modules/core-java-exceptions-4/README.md

@@ -10,4 +10,5 @@ This module contains articles about core java exceptions
 - [Get the Current Stack Trace in Java](https://www.baeldung.com/java-get-current-stack-trace)
 - [Errors and Exceptions in Java](https://www.baeldung.com/java-errors-vs-exceptions)
 - [Fix the IllegalArgumentException: No enum const class](https://www.baeldung.com/java-fix-no-enum-const-class)
+- [How to Fix EOFException in Java](https://www.baeldung.com/java-fix-eofexception)
 - [[<-- Prev]](../core-java-exceptions-3)

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/eof/EOFExceptionDemo.java

@@ -0,0 +1,16 @@
+package com.baeldung.exception.eof;
+
+import java.io.DataInputStream;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+
+public class EOFExceptionDemo {
+    public static void readInput() throws Exception {
+      InputStream is = new ByteArrayInputStream("123".getBytes());
+      DataInputStream in = new DataInputStream(is);
+      while (true) {
+        char value = (char)in.readByte();
+        System.out.println("Input value: " + value);
+      }
+    }
+}

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/eof/EOFExceptionDemo2.java

@@ -0,0 +1,22 @@
+package com.baeldung.exception.eof;
+
+import java.io.DataInputStream;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+import java.io.EOFException;
+
+public class EOFExceptionDemo2 {
+    public static void readInput() throws Exception {
+      InputStream is = new ByteArrayInputStream("123".getBytes());
+      DataInputStream in = new DataInputStream(is);
+      while (true) {
+        try {
+          char value = (char)in.readByte();
+          System.out.println("Input value: " + value);
+        } catch (EOFException e) {
+          System.out.println("End of file");
+          break;
+        }
+      }      
+    }
+}

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/eof/EOFExceptionDemo3.java

@@ -0,0 +1,19 @@
+package com.baeldung.exception.eof;
+
+import java.io.DataInputStream;
+import java.io.InputStream;
+import java.util.Scanner;
+import java.io.ByteArrayInputStream;
+
+public class EOFExceptionDemo3 {
+    public static void readInput() {
+        InputStream is = new ByteArrayInputStream("1 2 3".getBytes());
+        Scanner sc = new Scanner(is);
+        while (sc.hasNextInt()) {
+            int value = sc.nextInt();
+            System.out.println("Input value: " + value);
+        }
+        System.out.println("End of file");
+        sc.close();
+    }
+}

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/eof/EOFExceptionDemo2UnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.exception.eof;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.AfterEach;
+import java.io.PrintStream;
+import java.io.ByteArrayOutputStream;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EOFExceptionDemo2UnitTest {
+
+    private final PrintStream standardOut = System.out;
+    private final ByteArrayOutputStream outputStreamCaptor = new ByteArrayOutputStream();
+
+    @BeforeEach
+    public void setUp() {
+        System.setOut(new PrintStream(outputStreamCaptor));
+    }
+
+    @AfterEach
+    public void tearDown() {
+        System.setOut(standardOut);
+    }
+
+    @Test
+    void readInput()throws Exception {
+        EOFExceptionDemo2.readInput();
+        String expectedOuput = "Input value: 1";
+        expectedOuput += "\n" + "Input value: 2";
+        expectedOuput += "\n" + "Input value: 3";
+        expectedOuput += "\n" + "End of file";
+        assertEquals(expectedOuput, outputStreamCaptor.toString()
+                .trim());
+    }
+}

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/eof/EOFExceptionDemo3UnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.exception.eof;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.AfterEach;
+import java.io.PrintStream;
+import java.io.ByteArrayOutputStream;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EOFExceptionDemo3UnitTest {
+
+    private final PrintStream standardOut = System.out;
+    private final ByteArrayOutputStream outputStreamCaptor = new ByteArrayOutputStream();
+
+    @BeforeEach
+    public void setUp() {
+        System.setOut(new PrintStream(outputStreamCaptor));
+    }
+
+    @AfterEach
+    public void tearDown() {
+        System.setOut(standardOut);
+    }
+
+    @Test
+    void readInput() {
+        EOFExceptionDemo3.readInput();
+        String expectedOuput = "Input value: 1";
+        expectedOuput += "\n" + "Input value: 2";
+        expectedOuput += "\n" + "Input value: 3";
+        expectedOuput += "\n" + "End of file";
+        assertEquals(expectedOuput, outputStreamCaptor.toString()
+                .trim());
+    }
+}

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/eof/EOFExceptionDemoUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.exception.eof;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.AfterEach;
+import java.io.EOFException;
+import java.io.PrintStream;
+import java.io.ByteArrayOutputStream;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EOFExceptionDemoUnitTest {
+
+    private final PrintStream standardOut = System.out;
+    private final ByteArrayOutputStream outputStreamCaptor = new ByteArrayOutputStream();
+
+    @BeforeEach
+    public void setUp() {
+        System.setOut(new PrintStream(outputStreamCaptor));
+    }
+    
+    @AfterEach
+    public void tearDown() {
+        System.setOut(standardOut);
+    }    
+
+    @Test
+    void readInput_throwsEOFException() {
+        assertThrows(EOFException.class, () -> EOFExceptionDemo.readInput());            
+        String expectedOuput = "Input value: 1";
+        expectedOuput += "\n" + "Input value: 2";
+        expectedOuput += "\n" + "Input value: 3";        
+        assertEquals(expectedOuput, outputStreamCaptor.toString()
+            .trim());     
+    }
+}